import re



from apps.user.models import User
from django_redis import get_redis_connection
from rest_framework import serializers
from rest_framework_jwt.settings import api_settings

class CreateUserSerializer(serializers.ModelSerializer):

    sms_code = serializers.CharField(label='短信验证码', write_only=True)
    token = serializers.CharField(label='JWT token', read_only=True)

    class Meta:
        model = User
        fields = ['id', 'username', 'password', 'mobile', 'sms_code', 'token', 'avatar']

        extra_kwargs = {
            'username':{
                'min_length': 5,
                'max_length': 20,
                'error_messages':{
                    'min_length': '仅允许5-20个字符的用户名',
                    'max_length': '仅允许5-20个字符的用户名',
                },
            'password':{
                'write_only':True,
                'min_length': 8,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许8-20个字符的密码',
                    'max_length': '仅允许8-20个字符的密码',
                }
            }
            }
        }

        def validate_mobile(self, value):
            # 验证手机号
            if not re.match(r'^1[3-9]\d{9}$', value):
                raise serializers.ValidationError('手机号格式有误')
            return value

        def validate(self, data):
            # 判断验证码
            redis_conn = get_redis_connection('verify_codes')
            mobile = data['mobile']
            real_sms_code = redis_conn.get('sms_%s' % mobile)
            if real_sms_code is None:
                raise serializers.ValidationError('无效验证码')
            if data['sms_code'] != real_sms_code.decode():
                raise serializers.ValidationError('验证码错误')

            return data

        def create(self, validated_data):
            # 重写保存方法，密码加密

            # 移除sms_code
            del validated_data['sms_code']

            user = super().create(validated_data)
            user.set_password(validated_data['password'])
            user.save()

            # 签发token
            jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
            jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER

            payload = jwt_payload_handler(user)
            token = jwt_encode_handler(payload)

            user.token = token
            return user

